2
Th e Sa n Francisco Sunday Call nerr across the country from Toury to Artenay and back, a distance of 17.4 miles. The year 1303, was to see al l previ- o us records utterly eclipsed. On July 80 Orville Wright successfully com- pleted the gov ernments test at Fort - Myerby making a cross country flight -of 10 miles with a passenger aboard at an average of speed of 42.58 miles per hour. The machine was accepted . he government an d the Wrights were paid $30,000 for it. The most .•sensational event of th e year wa s JBleriot's crossing of th e ch anne l on July 25 in his monoplane. - The great av iat ion meet at Rhelma began on August 22," and Immediately th e world wa s shown how great an advance had been made in human flight. Thirty-eight aeroplanes were entered. and 35 of them made succ essful flights. Biplanes : and monoplanes we r e abo ut equally^livided. Curtiss represented America in his light, swift biplane. As many as five, aeroplanes were tn tha ai r at a time and the spectators were. treated to a night abso lut ely unique in th e history of th e world. Gusty winda prevailed. b*ut th e pilots seldom stopped- on that account, and exhibited remark- able skill in controlling their machines. I n he test s for high speed over short courses. th e Bleriot monoplane and Cur- tiss biplane ,were evenly matched, Ble- riot ; winning th e 6.21 mile race at a speed of 47.75 miles per hour j>nd Cur- tlsa /securing the international cup by covering the 12.42 mile course at a speed ;of .47.04 miles per hour. Th at th e aeroplane had made . wonderful strides in endurance was shown by Farman'a winning the long distance race,- with a record of 111.83 mile 3in 3 hours 4 minutes 55 2-3 seconds. Early i n October Orville Wright. In an exhibition", a t Berlin, rose to tha .unprecedented .height ' of over .1,600 feet. At about t he same time his broth- er , during I he ;Hudaon-Fulton festival. flew successfully, trom Governors island up the/Hudson, river, around one of th e visiting T warships, moored off Grants tomb (and back to the island. /.Unquestionably.- th e .field of sport wll be th e first and most successful sphere; o f , exploitation "for the aero- plane. I t s possible today to place an order for a i lying machine for delivery /at an early date In automobile row. San Francisco.:" as more than one of the auto manufacturing companies have gone into th e .business of .making th a machines.' Before th e end of th e pres- ent, year flights by local enthusiasts owning : heir, machines- wll be a .com- mon •. sight around - San - Francisco bay. I t s said that several ambitious sports- men 'are eager ; for the * honor - of ;, being first -to \ make- a ~ start in Golden Gats parkland -t!y. across th e city and th» bay . to Oakland. - I T ma y be said with mucti reason fhat to t he United States is due th e credit for teaching men how they ma y fl y through the air. The reali- zation of the dream of th e centuries may be traced to th e efforts and dis- coveries of four Americans. That th e problem of successful fligh was n ot solved at lrast a decade earlier was due to the fact that two of the Inves- tigators exhausted their funds and their courage when they were upon the veVy» ev e of practical results, though by rea- son of man's very inexperience there \u25a0u-as no way of knowing at time how close they had come. Hiram Maxim, backed by several wealthy men, began his experiments at his place near Lon- don In ISS9. He w as t he first man to simply the principle of superposed planes, a principle used in the successful flying jiiacLnes cf every type tod ay. The late Professor Langley, secretary 'of the Sm;thsoniar» institution, began his ex-. I'eriments en a small scale almo st as early as did Maxim, and In 1596 his model, weighing only 27 pounds and driven by a one horsepower engine, made three flights over the Potoinac river. Congress then appropriated $50,- OCrj to cnaole th e inventor to build a full sized tuachinj. which did little more than pitch from it s raft into th e Polo- mac In the light of present day knowedge there is every .reason, to be- lieve that Uot h the Maxim and Langley machines were, built upon practical lines and that a little more money and j.ei severance would ha ve seen world t-tartling flights. Orville and Wilbur Wright, two bicycle makers of Day- ton, 0., benefited by th e experiments of Mox imand Langley in th e building, and flying ot girders, and after three years' practice in the sand dunes of North Carolina they pu t a motor upon one of their gliders and made th e first success- fu l man fligh with a he avier th an ai r machine In the history of the world. Other inventors, both in America and Europe, were soon, in the^air with ma - chines more or less resembling th e Wright type, and though today th e WJghts ar e in sharp contest with those wh o came after them the laurels; seemed fixed for al l 'time upon the brows of th e two modest bicycle build- - crs from Ohio. Advanced students of aeronautics are agreed that there are but fou r met h- while using th e machines for scouting purposes. Wilbur Wright,-; however, says that there are positive advantages In seeking the high levels of th e air. The difficulty of finding a landing place, in ; ase of th e . motorl stopping," wll , e largely obviated by flying high! < Thus,, at one, mile elevation, in case of stop- page of th e mo tor , the ; operator 'would be -i n a position to'^ glide for seven miles, on a slope of one in seven, before reaching th e groun d.. Since this glide In orUer to bring the wandering cen- ter/of ai r pressure back Into coinci- dence with the center of gravity th e Wright brothers have devised a method of warping or bending -the outer : nd of th e /planes./ 4 The same balancing effect is obtained; by hinging flat sur- faces or tips to th e outer ends of -the planes ; winging them, up .or down as tJ^e .^exigencies of the: mo- ment may require. ;/ The French ; all these , hinged ti ps ailerons. : n ; th e v- later Glenn Curtiss- machines the ail- erons "are removed entirely, from : th e ends of the main planes and hung, be- tween th em." , ;v ' The Wright '. biplanes - have : requently carried a paseenger^in addition to th a aviator, and In France several of/ the machines have made extended ! and suc- cessful flights while ; arrying three persons. The weights, of machines differ, .and the/. question of which builder's. machine is actually, the faster ha s hardly been settled. In. contests the Wright * machines have times ;been handicapped and placed at great: disadvantages by the fact; that their - drivers used 'none' of th e skill with ; which the. inventors handle: them. The Wright machine of ;30 horsepower were removed th e Kn gllsh ight rea- sonably expect to see the greater part of the Invading army drowned I n th» channel. The first b i g achievement of th e Wright brothers was' made over afield at Dayton, Ohio, on October 6, 1905. Numerous short flights' bad been . mads by them^with a much secrecy as pos- sible, bu t on that day one of the broth- ers drove the machine 24 miles in S3 minutes, a speed of 38 miles an hour. .Santos Dumont built a cellular machine and made ' some short flights- In Franca i: in 1906. Bleriot* and J Esnault-Pelteris had considerable success with- th e monoplane, and Farman and Dela- grange with th e biplane. Real - P ro gr es s B e gi ns ' /.Flying progressed by leaps and bounds during 1908/ ; rville/ Wright, in the government ' tests at Fort Slyer. Washington, made flights of over an hour's /duration, and \ u25a0: on various occa- sions carried an officer . as a passenger. Wilbur ; Wright /went to France and, by fulfilling /certain condition s, . old th e 'French rights'; to his patents "for.; $100,- 000. ; n" th e successful / trials he > flew .42,; miles in one hour and 32 minutes on September 21, and on October 10 made a* fligh ot > over an hour, . carrying : on<f passenger.// On ; nother /occasion he rose, to V height of 380 feet, and on .the last day 'of the, year, he" broke -all rec- ords by\a.Tfl!ght of 2hours and 20 min- utes : duration^ in which he covered 77 miles. I n October, Farman in' his Voi- si n biplane /made th e first cross country trip , on ; record, - flyingffrom Chalons' to Rheims/a*distance of ;i7,. miles. ' I n he same i onth i leriot, ?In a fmonoclane, i--- -. »r» r \u25a0>-.*-•\u2666*\u25a0 '-..;--\u25a0 \u25a0•\u25a0 \u25a0\u25a0 . . ca n be - made in an y direction, a choice of a /landing" place can be .made out of th e Y total \ area \u25a0- of . 150 square ; miles included^ In'^a circle ;of 14- miles ? in diameter. .Hgh {flying, too, will take th e machine ; ou t of th e belt of /air cur- rents-and 'eddies -that,followthescon- tour of the 'earths; surf ace. .. / ; lerlot's" flight'^ of 21 miles across th e Eng lish channel r from 'France to Englandj filled /the» ; nglish /with V fear of t. a^ ; possible invasion '.'• from th e - . air. which their peerless - navy "would /\u25a0 he quite to circumvent. ' London had of -the Germans .dropping down '• upon them ' f om /the sky. -The fear s e e m W ' r i o t. well 1 grounded r h'en- I t is remembered /that/i ra ? single/ flying machine has /never I arried ; ore'f than three* men;- and ; that ; he' transportation of /an/army - would ' require 'such a* flock of : lyingiinachines that/fhelr~construc- tion -and -park ing :CO uld3never/be: kept secret.* '' In ' fact,^ unless f many , of /the present f attendant J dangers -of .-flying, ,:-s-f..7 i:/*— .-.. r~~ x : .:\u25a0\u25a0'•'\u25a0 \u25a0'\u25a0'.\u25a0\u25a0','\u25a0':' ..\u25a0".., weighs 800 pounds and ordinarily-' can be driven .a t about miles '. an ; hour. The Curtissmach ine of 60' horsepower weighs 600 pounds and has made 48 miles'* an hour. Santos-Dumont built a -little.; 30. horsepower machine and at - tained j speed\which was estimated at 55 "miles an hour. I f he rate of im- provement continues the mile a-minute g^it .will i oo h ' be ; ommon enough ; How. much- or how soon- i t wll be exceeded' o informed prophet has ' to / say. The immediate': revelations; in ; store willVerhaps concern" height ratherithan' speed; :'Now;lthatyanyihumber^of ex- perienced men are .willing" to trust their lives ' to ( their.. flyingrmMhiries,' vtheyVarW yielding! to th e /inevitable temptationito see ; h oW / hi gh they' ca n go. r { The/presint record-i s -close -t o ; ,OooVf eet 'above ;. th e ; grbuni v ' Several / aviators'-- have V ex- : \u25a0ceeded' r l,soo;feet..i r At^flrst;it .was 'be- Ileved •;the >. ohlyj, necessity for - soaring to a great height j ould , be .f or. the pur- pose of keeping lout (of) range /of Tguna ,: u25a0\u25a0'•" \u25a0\u25a0'"\u25a0"\u25a0' --p:-n: , ------ :;-• ods by which roan may hope to # lift him- self above the earth as do the birds. The first of these is by the use of a ba g or envelope fill edwth a gas lighter than air, equipped wth propellers for sending i t forward. Count Zeppelin's great airships, composed of many com- partments each containing a balloon, represent th e most sensational results obtained by the use of gas. A second possible method is by th e employment of a machine which shall flap it s wngs exactly as a duck does in flight. A third met ho d involv es the^ise of revolving screws which lift straight into th e air. No results wo rth serious consideration have been accomplished by. either of these methods^" The fourth method is that en- gages .the close attention of th e world today the use of an aeroplane that lit- erally skims th e air. Inlying in an aeroplane. is more hazardous than skat- ing upon the thinnest ice, for no ice is as thin as air or less supporting. An aeroplane must 'be kept going so fast that I t has no' tints to fall. I t must be propelled through to fall. I t must be propelled through the air at such speed that the result- ing pressure of air beneath; wll sus- tain it . Thus th e man flying is really safest when he seems to be taking. th e greatest chances when he Is travel- ing at the. highest speed. Single arid Double Planes All aeroplanes may be divided into two classes,' biplanes and monoplanes. The monoplanes have a single horizon- ta l spread of canvas' wngs; the ,bi-. planes have one plane superposed above th e other at a height of about fl\-e feet. The Wright brothers, Glenn Curtiss and Henri., Farman machines are blplanqs; the Hubert Latham, Bleriot and; Santos Dumont . machines are monoplanes.. I t Is , claimed that each": type has certain advantages over th e other,, though the biplane enjoys th e greater popularity among aviators at th e present. The double decked machine,. having a larger support ing surfa ce, ha s greater, carry- ing capacity; i t is as easily ' \u25a0, steered, as th e single deck er, and on account of fits bracing can,, stand a st rai n th at ? the other can not. The cla im is made for th e monoplane that \u 25a 0 it Is*, naturally the faster ~ of the- two because it has; less headon resistance to overcome. *It is apparently nnto t as safe as th e biplane. .When man had Revised aw aeroplane that could fly, he ha d ye t to learn how to fly it . He had to go. through many bitter experiences in gaining a work- i n g knowedge of that invisible thing, th e air. :- . Plying ha s already had many martyrs. The wind is a factor, which must constantly be reck oned with. But even wth no perceptible wind the ai r is full of surprises. So far. man ha s usually flown close to th e ground, -and, only at a height is the ai r ever really fitfed and stationary. The aircurrents follow th e contours of the earths sur- aviator often upon an ascending current of air, sails across a hilltop and comes to the ground rather unexpectedly." irfs machine was reg- ulated in accordance with ; th e ascend- in g current, and when he crossed- th e hilltop he encountered a descending ai r current and came down before he "could readjust. ~ >' . V Waldemar Kaempfert ; thus describes th e chief difficulties of controllings; a flying machine in the air: "The fragile mechanism \pf. plaWes,' rudders and propellers with "which "-the aviator rushes through th e ai r is sub- jected to, two. forces the: pressure of th e ai r and its own weight. \u25a0The. air pressure acts upward, and, therefore, sustains th e aeroplane i n flight;,' the weight of the different -parts naturally actts downward.- I f he center of .air pressure or upwardly acting force hap- pens to shift to one side. of the center of gravity "the machine will capsize and crash to the ground. ';* Why?' Be- cause the -upwardly.-acting 'pressure is more powerful at high speed than th e downwardly acting weight of th e ma- chine.- I n other words,. an, aeroplane ( i s a kind .of : eesaw/subjected to ; the 'ac- tion of two opposing - and /unequal forces. . The only way -t o mainta in* the seesaw/ in equilibrium is ;t o bring the two;, forces together in the middle- so that -they wll act, the /one* upward and th e other downward, through 'the same point. / When the aviator ihas ac- complished this feat he has brought the center: of air |ressure f and-the /center of 'gravity into'colncidence. Since the "wind.'.despite its* apparent steadiness, is in- reality composed of \u25a0innumerable 1 piiffs and gusts, currents . and currents," th e cent er "of <_ air/pressure -is constantly shifting/^ which: renders] th« feat of / balancing Jextremely^ difficult;^ SHAMING T H E BIRDS

Early Aviation History (1910)

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Sa n Francisco Sunday Call

nerr across the country from Toury to

Artenay and back, a distance of 17.4

miles.The year 1303, was to see all previ-

ous records utterly eclipsed. On July80 Orville Wright successfully com-pleted the governments test at Fort-Myerbymaking a cross country flight

-of 10 miles with a passenger aboardat an average of speed of 42.58 milesper hour. The machine was accepted

.he government and the Wrights

were paid $30,000 for it. The most.•sensational event of the year wa s

J B l e r i o t ' s crossing of the channel onJuly 25 inhis monoplane.-

The great aviation meet at Rhelmabegan on August 22," and Immediatelythe world wa s shown how great anadvance had been made inhuman flight.Thirty-eight aeroplanes were entered.and 35 of them made successful flights.Biplanes:and u 2 5 a 0 monoplanes were aboutequally^livided. Curtiss represented

America in his light, swift biplane.As many as five,aeroplanes were tn thaair at a time and the spectators were.treated to a night absolutely uniqueinthe history of the world. Gusty windaprevailed. b*ut the pilotsseldom stopped-

on that account, and exhibited remark-able skill incontrolling their machines.Inhe tests for high speed over shortcourses. the Bleriotmonoplane and Cur-tiss biplane ,were evenly matched, Ble-riot;winning the 6.21 mile race at aspeed of 47.75 miles per hour j>ndCur-tlsa /securing the international cup bycovering the 12.42 mile course at aspeed ;of . 4 7 . 0 4 miles per hour. Thatthe aeroplane had made .. wonderfulstrides in endurance was shown by

Farman'a winning the long distancerace,- with a record of 111.83 mile3in3 hours 4 minutes 55 2-3 seconds.Early inOctober Orville Wright. In

an exhibition",at Berlin, rose to tha.unprecedented .height

'

of over .1,600

feet. Atabout the same time hisbroth-er, duringIhe;Hudaon-Fulton festival.flew successfully, trom Governors islandup the /Hudson, river,around one ofthevisitingTwarships, moored off Grantstomb (and back to the island./.Unquestionably.- the .field of sportwllbe the first and most successfulsphere; of,exploitation "for the aero-plane. Its possible today to place anorder for ailyingmachine for delivery

/at anearly date Inautomobile row. SanFrancisco.:" as more than one of theauto manufacturing companies havegone into the .business of.making thamachines.' Before the end of the pres-ent, year flights by local enthusiastsowning:heir,machines- wllbe a .com-mon•. sight around

-San

-Francisco bay.

Its said that several ambitious sports-men 'are • eager ;for the

*honor

-of;,being

first -to\make- a~ start in Golden Gats

parkland -t!y. across the city and th»bay.toOakland.

-

y be said with mucti reason

to the United States is due the

for teaching men how they

fly through the air. The reali-of the dream of the centuries

traced to the efforts and dis-

of four Americans. That theof successful flighwas not

at lrast a decade earlier was

the fact that two of the Inves-

exhausted their funds and their

when they were upon the veVy»practical results, thoughbyrea-man's very inexperience therewayofknowing at the. timehow

they had come. Hiram Maxim,by several wealthymen, began

at his place near Lon-

ISS9. He was the first man toprincipleofsuperposed planes,

used in the successful flying

cfevery type today. The lateLangley, secretary 'of theinstitution, began his ex-.

en a small scale almost asas did Maxim, and In 1596 hisweighing only 27 pounds and

by a one horsepower engine,

three flights over the PotoinacCongress then appropriated $50,-

cnaole the inventor tobuild a

tuachinj. which did littlemorefrom its raft into the Polo-

In the light of present day

there is every.reason, to be-

Uoth the Maximand Langley

were, built upon practical

that a littlemore money and

would have seen worldflights. Orville and Wilbur

two bicycle makers of Day-

benefited bythe experiments ofand Langley inthe building,andot girders, and after three years'

in the sand dunes of North

they put a motor upon one of

and made the first success-

flighwith a heavier thanair

In the history of the world.

inventors, both in America andwere soon,inthe^air withma-

more or less resembling the

type, and though today the

are in sharp contest with

o came after them the laurels;

fixed for all 'time upon the

of the two modest bicycle build- -

Ohio.

students of aeronautics are

that there are but four meth-

while using the machines for scouting

purposes . Wilbur Wright,-;however,

says that there are positiveadvantages

In seeking the high levels of the air.The difficultyof findinga landingplace,

in;ase of the .motorlstopping," wll,elargely obviated by flyinghigh! < Thus,,

at one, mile elevation, incase of stop-

page of the motor, the;operator 'wouldbe -in a position to '^ glide for sevenmiles, on a slope of one ins even, beforereaching the ground.. Since this glide

InorUer to bring the wandering cen-

ter/of air pressure back Into coinci-dence with the center of gravity theWright brothers have devised amethodof warping or bending-the outer:nd

of the /planes./ 4 The same balancing

effect is obtained; by hinging flat sur-

faces or tips to the outer ends of-theplanes ;winging them, up .ordown as t J ^ e .^exigencies of the: mo-

ment may require.;/The French;allthese ,hinged tips ailerons.:n

;the v-

later Glenn Curtiss- machines the ail-erons "are removed entirely, from:theends of the main planes and hung,be-

tween them." •,;v '

The Wright '.biplanes - have :requently

carried a paseenger̂ in addition to thaaviator, and InFrance several of/ the

machines have made extended !and suc-cessful flights while;arrying threepersons. The weights, of machinesdiffer,.and the/. question of whichbuilder's.machine is actually, the faster

has hardly been settled.••In.contests

the Wright*machines have several

times ;been handicapped and placed at

great: disadvantages by the fact; thattheir -

drivers used 'none' of the skillwith;which the . inventors handle: them.

The Wright machine of;30 horsepower

were removed the Kngllshmight rea-sonably expect to see the greater part

of the Invading army drowned Inth»

channel.The first bigachievement of the

Wright brothers was' made over afield

at Dayton, Ohio, on October 6, 1905.Numerous short flights'bad been .mads

bythem^with amuch secrecy as pos-

sible, but on that dayone of the broth-ers drove the machine 24 miles in S3minutes, at a speed of 38miles an hour..Santos Dumont builta cellular machine

and made'some short flights-InFranca

i:in 1906. Bleriot*and J Esnault-Pelterishad considerable success with- themonoplane, and Farman and Dela-

grange with the biplane.

Real - P rogr es s Begins'

/.Flying progressed by leaps andbounds during 1908/;rville/Wright,inthe government'

tests at Fort Slyer.Washington, made flights of over an

hour's /duration, and u 2 5 a 0 : on various occa-sions carried an officer.as a passenger.

Wilbur;Wright / w e n t to France and, byfulfilling/certain conditions, .old the'French rights'; to his patents "for.;$100,-

000.;n"the successful / trials he >flew

. 4 2 , ; miles inone hour and 32 minutes onSeptember 21, and on October 10 madea*flighot > over an •hour,.carrying:on<fpassenger.// On;nother / o c c a s i o n herose,toVheight of 380 feet, and on .thelast day 'of the,year, he" broke -all rec-ords by\a.Tfl!ght of 2hours and 20 min-utes:duration^ inwhich he covered 77miles. InOctober, Farman in'his Voi-sin biplane / m a d e the first cross countrytrip,on;record,

- flyingffromChalons ' toR h e i m s / a * d i s t a n c e of;i7,.miles.

'Inhe

sameionthileriot,?In a fmonoclane,i---r. - \ u 2 5 a 0 - \ u 2 5 a 0 \ u 2 5 a 0 -. »r»ru 2 5 a 0 • - \ u 2 5 a 0 > - . * - • \ u 2 6 6 6 * \ u 2 5 a 0

' -. . ;--\u 25a0\u25a0• \u 25a0\u25a0\u25a0 . .

ca n be-made inany direction, a choice

of a/landing" place can be .made out

of the Y total \area \ u 2 5 a 0 - of. 150 square ;milesincluded^ In '^a circle ;of 14-miles ? in

diameter. .Hgh{flying,too, will takethe machine ;out of the belt of/air cur-rents-and 'eddies -that,followthescon-

tour of the 'earths; surface. .. /;lerlot's" flight'̂ of 21 miles across

the English channel r from 'France to

Englandj filled / t h e»;nglish /withV fearoft. a^;possible invasion ' . ' • from the

-.air.

which theirpeerless

-navy

"would/ \ u 2 5 a 0 he

quite to circumvent. 'London

had of -the Germans .dropping

down'• upon \ u 2 5 a 0 • them

'fom/the •sky. -The

fear s e e mW ' r i o t. well1groundedrh'en-It

is remembered /that/ira ? single/ flying

machine u 2 5 a has /neverIarried;ore'f thanthree*men ;- and;that;he' transportation

of/an/army-would'require'such a* flock

of:lyingiinachines t h a t / f h e l r ~ c o n s t r u c -tion -and -parking :COuld3never/be: kept

secret.*''In'fact,̂ unless fmany,of /the

present fattendant Jdangers -of.-flying,,:-s-f..7 i:/*—• . - . . r~~ x:. : \ u 2 5 a 0 \ u 2 5 a 0 ' • ' \ u 2 5 a 0 \ u 2 5 a 0 ' \ u 2 5 a 0 ' . \ u 2 5 a 0 \ u 2 5 a 0 ' , ' \ u 2 5 a 0 ' : ' ..\u25a0"..,

weighs 800 pounds and ordinarily-' canbe driven .at about miles '.an;hour.The Curtiss machine of 60' horsepower

weighs 600 pounds and has made 48

m i l e s ' * an hour. Santos-Dumont builta -little.;30. horsepower machine and at-

tained j speed\which was estimated at

55 "miles an hour. Ifhe rate of im-provement continues the mile a-minute

g^it .willi oo h 'be;ommon enough;How.much- or how soon- itwllbe exceeded'no informed prophet has

'to/say.

The immediate': revelations; in;storewil lVerhaps c o n c e r n " height ratherithan'speed; :'Now;lthatyanyihumber̂ of ex-

perienced me n a r e.willing"to trust theirlives'to(their.. f ly ingrmMhir ies , 'vtheyVarW

yielding!tothe / i n e v i t a b l e temptationito

see ; h oW / highthey' cango.r{The/pres in trecord-is -close -to;, O o o V f eet ' a b o v e ;. the;grbuni v

'

Several /a v i a t o r s ' - - have Vex-:\ u 2 5 a 0 c e e d e d '

rl,soo;feet..i rAt^flrst;it.was 'be-

Ileved• ; the >. ohlyj ,necessity for-soaring

toa great heightjould,be .f or. the pur-

pose of keeping lout(of)range /ofTguna,:u 2 5 a 0 \ u 2 5 a 0 ' • " \ u 2 5 a 0 \ u 2 5 a 0 ' " \ u 2 5 a 0 " \ u 2 5 a 0 '--p:-n:,

- - - - - -:;-•

ods bywhich roan mayhope to#

lifthim-

self above the earth as do the birds.

The first of these is by the use of a

bagor envelope filledwtha gas lighter

than air, equipped wth propellers for

sending it forward. Count Zeppelin's

great airships, composed of many com-

partments each containing a balloon,

represent the most sensational results

obtained bythe use of gas.

A second possible method is by theemployment of a machine which shallflapits wngs exactly as a duck does inflight. Athird method involves the^iseof revolving screws which liftstraight

into the air. No results worth seriousconsideration have been accomplished

by.either ofthese methods^"The fourth method is that en-

gages .the close attention of the worldtoday

—the use ofan aeroplane that lit-

erally skims the air. Inlying in an

aeroplane. is more hazardous than skat-ing upon the thinnest ice, for no ice is

as thin as air or less supporting.

An aeroplane must 'be kept going

so fast that It has no' tints tofall. Itmust be propelled through

to fall. Itmust be propelled through

the air at such speed that the result-

ing pressure of air beneath; wllsus-tain it. Thus the man flying is really

safest when he seems to be taking.thegreatest chances

—when he Is travel-

ingat the.highest speed.

Single arid D o u b l e P l a n e sAllaeroplanes may be divided into

two classes, ' biplanes and monoplanes.

The monoplanes have a single horizon-tal spread of canvas' wngs; the ,bi-.planes have one plane superposed above

the other at aheight of about fl \-e feet.TheWright brothers, Glenn Curtiss andHenri.,Farman machines are blplanqs;

the Hubert Latham, Bleriot and; SantosDumont .machines are monoplanes.. ItIs,claimed that each": type has certain

advantages over the other,, though thebiplane enjoys the greater populari tyamong aviators at the present. Thedouble decked machine,. havingalarger

supporting surface, has greater, carry-

ingcapacity; itis as easily \ u 2 5 a 0 , steered, as

the single decker, and on account offitsbracing can,, stand a „strain that? the

other can not. The claim is made for

the monoplane that itIs*,naturally the

faster~ of the- two because ithas; less

headon resistance to overcome. *Itisapparently nnto t as safe as the biplane.

.When man had R e v i s e d aw aeroplane

that could fly,he had yet tolearn howto flyit. He had togo. through many

bitter experiences ingaining a work-ingknowedge of that invisible thing,

the air. :- .Plyinghas already had many

martyrs. The wind is a factor, whichmust constantly be reckoned with. Buteven wth no perceptible wind the airis full of surprises. So far. man hasusually flown close to the ground,-and,only at a height is the air ever really

fitfed and stationary. The aircurrentsfollow the contours of the earths sur-

face. The aviator often rises upon an

ascending current of air, sails across ahilltopand comes to the ground ratherunexpectedly." irfs machine was reg-

ulated ina c c o r d a n c e with;the ascend-

ing current, and when he crossed- thehilltophe encountered a descending air

current and came down before he "couldreadjust.

~>'. V

Waldemar Kaempfert;thus descr ibesthe chief difficulties of controllings;aflyingmachine in the air:

"The fragile mechanism \pf. plaWes,'

rudders and propellers with"which"-the

aviator rushes through the air is sub-jected to, two. forces

—the: pressure of

the air and its own weight. \ u 2 5 a 0 T h e . airpressure acts upward, and, therefore,

sustains the aeroplane inflight;,'theweight of the different -parts naturally

actts downward.- Ifhe center of.airpressure or upwardly acting force hap-

pens to shift to one side. of the centerof gravity "the machine willcapsize and

crash to the ground. ';*Why?' Be-

cause the -upwardly.-acting 'pressure is

more powerful at high speed than thedownwardly acting weight of the ma-chine.- Inother words,. an,aeroplane(is

a kind .of:eesaw/subjected to;the 'ac-tion of two opposing -

and /unequalforces. . The onlyway-tomaintain* the

seesaw/ in equilibrium is;tobring the

two;,forces together

in the middle- sothat -they wll act, the /one* upwardand the other downward, through 'thesame point. /When the aviator ihas ac-complished this feat he has brought thecenter: of air |ressure f

and- the /center

of 'gravity into ' colnc idence . Since the"wind. '.despite its*apparent steadiness, isin- reality composed of \ u 2 5 a 0 i n n u m e r a b l e 1

piiffs and gusts, currents .andcurrents," the center "of<_ air/pressure -isconstantly shifting/^ which: renders] th«feat of/balancingJextremely^ difficult;^

T H E B I R D S